Centerless grinding machine for finish machining of round steel surface

Abstract

The utility model relates to the related technical field of round steel, in particular to a centerless grinding machine for finish machining of the surface of the round steel, which comprises a lathe seat, and a grinding mechanism is arranged above a machining table. According to the centerless grinding machine for round steel surface finish machining, through the arrangement of the grinding mechanism, a second motor drives a lead screw to rotate, a limiting rod limits rotation of a lifting block, the lead screw rotates to enable the lifting block to linearly move along the lead screw and the limiting rod, when the second motor rotates forwards, the lifting block drives a connecting plate and a grinding wheel to descend, and after the grinding wheel makes contact with round steel, the grinding wheel rotates at a high speed for grinding; grinding pressure needs to be adjusted or grinding needs to be stopped, an operator enables a second motor to rotate reversely through a controller, a lead screw drives a lifting block to ascend, a grinding wheel is far away from the round steel, in the whole process, a limiting rod ensures that the grinding wheel ascends and descends stably and accurately, and the operator can further accurately control the rotating speed and the rotating direction of the motor; position and speed of the grinding wheel are adjusted, and machining efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to round steel technical field especially relates to a centerless grinding machine for round steel surface finish machining. BACKGROUND

[0002] Round steel refers to solid long strip steel material with circular section, according to chemical composition, round steel can be divided into carbon steel round steel and alloy steel round steel, and carbon steel round steel can be subdivided into low carbon steel round steel, medium carbon steel round steel (carbon content) and high carbon steel round steel, and alloy steel round steel is added with chromium, nickel, manganese, silicon and other alloy elements on the basis of carbon steel to improve the performance of steel material, from the production process, round steel is divided into hot rolling, forging and cold drawing three kinds, and there are differences in size precision, surface quality and mechanical properties of round steel produced by different processes, and in modern industrial production, the application demand of round steel is increasing and increasingly high-end, in order to guarantee the processing stability and improve the processing efficiency, therefore, a centerless grinding machine for round steel surface finish machining is particularly needed.

[0003] But the traditional round steel surface processing mode mostly adopts manual operation, manual operation mainly depends on the experience and skill level of workers, and there are differences in operation methods of different workers, and even the same worker may operate at different times due to fatigue, distraction and other factors, so it is difficult to ensure the consistency of processing precision, and manual operation takes a long time, especially in batch production, the production cycle is greatly lengthened, and it is difficult to meet the demand of modern industrial rapid production. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a centerless grinding machine for round steel surface finish machining, which has an automatic limiting transmission device for round steel and a polishing device for the surface of round steel, and solves the problem of low efficiency of traditional processing mode using manual operation.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a centerless grinding machine for round steel surface finish machining, including lathe seat, the surface of lathe seat is installed with cabinet door, the bottom of lathe seat is installed with shock absorbing foot pad, the upper fixed connection of lathe seat has processing table, the upper fixed connection of processing table has controller, the upper fixed connection of processing table has operation table, the upper of operation table is provided with limiting transmission mechanism, the surface of limiting transmission mechanism is provided with workpiece, the upper of processing table is provided with polishing mechanism;

[0006] The polishing mechanism comprises a fixed frame, a motor shell, a second motor, a lead screw, a limiting rod, a lifting block, a connecting plate and a polishing wheel, the upper side of the machining table is fixedly connected with the fixed frame, the upper side of the fixed frame is fixedly connected with the motor shell, the inside of the motor shell is installed with the second motor, the output end of the second motor is fixedly connected with the lead screw, the inner end of the fixed frame is fixedly connected with the limiting rod, the surface of the lead screw and the limiting rod is slidably connected with the lifting block, one end of the lifting block is fixedly connected with the connecting plate, and the surface of the connecting plate is installed with the polishing wheel.

[0007] Preferably, the damping foot pads are arranged at the bottom of the lathe seat in four groups, and are symmetrically distributed at the four corners of the bottom of the lathe seat.

[0008] Preferably, the limiting transmission mechanism comprises a support, a cross beam, a sliding groove, a connecting rod, a wheel disc, a first screw rod, a partition block, a second screw rod, a sliding block, a mounting frame, a limiting wheel, a first transmission wheel, a first roller, a first motor, a track, a second roller and a second transmission wheel, the upper side of the operating table is fixedly connected with the support, the middle part of the support is fixedly connected with the cross beam, the surface of the cross beam is provided with the sliding groove, the inner end of the cross beam is rotatably connected with the connecting rod, one end of the connecting rod is fixedly connected with the wheel disc, the other end of the connecting rod is fixedly connected with the first screw rod, one end of the first screw rod is fixedly connected with the partition block, one end of the partition block is fixedly connected with the second screw rod, the surfaces of the first screw rod and the second screw rod are slidably connected with the sliding block, the upper side of the sliding block is fixedly connected with the mounting frame, the inner side of the mounting frame is installed with the limiting wheel, the upper side of the support is installed with the first transmission wheel, one end of the first transmission wheel is fixedly connected with the first roller, one end of the first roller is fixedly connected with the first motor, the outer side of the first roller is attached with the track, the other end of the track is attached with the second roller on the inner side, one end of the second roller is fixedly connected with the second transmission wheel.

[0009] Preferably, the position of the sliding block corresponds to the position of the sliding groove, and the outer wall size of the sliding block is consistent with the inner wall size of the sliding groove.

[0010] Preferably, the screw threads of the first screw rod and the second screw rod are opposite in rotation direction, and the first screw rod and the second screw rod are symmetrically arranged about the middle axis of the partition block.

[0011] Preferably, the first motor and the first roller cooperatively form a rotating structure, and the track drives the second roller to rotate through the first roller.

[0012] Preferably, the second motor and the lead screw cooperatively form a rotating structure, and the lifting block slides in the inside of the fixed frame through the lead screw.

[0013] Compared with the prior art, the present utility model provides: a centerless grinding machine for finishing surface of round steel, has the following beneficial effects:

[0014] 1. The centerless grinding machine for surface finishing of round steel, through the setting of the limiting transmission mechanism, when machining the round steel, first according to the diameter of the round steel, the rotating disc drives the connecting rod, and the first and second screws rotate synchronously, because the screw thread directions of the two screws are opposite, under the limitation of the sliding groove, the sliding block drives the limiting wheel to move, after adjusting the distance, the round steel is placed, then the first motor is started, the first roller is driven, the second roller is rotated through the track transmission, the first and second transmission wheels are driven, the transmission wheels drive the round steel to move axially through friction, the limiting wheel supports the round steel stably throughout the process, and the round steel enters the grinding mechanism according to a predetermined track and speed, so that the continuity and precision of machining are ensured.

[0015] 2. The centerless grinding machine for surface finishing of round steel, through the setting of the grinding mechanism, the operator starts the second motor of the grinding mechanism through the controller, the motor drives the screw rod to rotate, the limiting rod limits the rotation of the lifting block, the screw rod drives the lifting block to move linearly along the screw rod and the limiting rod, when the second motor rotates forward, the lifting block drives the connecting plate and the grinding wheel to descend, after contacting the round steel, the grinding wheel rotates at high speed to polish, and the scale and burrs are removed, so that the surface smoothness and precision of the round steel are improved, if polishing pressure needs to be adjusted or polishing needs to be stopped, the operator reverses the second motor through the controller, the screw rod drives the lifting block to rise, and the grinding wheel is away from the round steel, and in the whole process, the limiting rod ensures that the grinding wheel rises and falls stably and accurately, and the operator can also accurately control the motor speed and rotation direction, adjust the position and speed of the grinding wheel, and improve the machining efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic view of the appearance side structure of the utility model;

[0017] Figure 2 It is a schematic view of the mutual cooperation structure of the first screw rod and the second screw rod of the utility model;

[0018] Figure 3 It is a schematic view of the mutual cooperation structure of the first roller and the second roller of the utility model;

[0019] Figure 4 It is a schematic view of the grinding mechanism structure of the utility model.

[0020] In the figure: 1, lathe seat; 2, cabinet door; 3, shockproof foot pad; 4, processing table; 5, controller; 6, operation table; 7, limiting transmission mechanism; 701, support; 702, crossbeam; 703, sliding groove; 704, connecting rod; 705, wheel disc; 706, first screw rod; 707, partition block; 708, second screw rod; 709, sliding block; 710, mounting frame; 711, limiting wheel; 712, first transmission wheel; 713, first roller; 714, first motor; 715, track; 716, second roller; 717, second transmission wheel; 8, processing piece; 9, polishing mechanism; 901, fixing frame; 902, motor shell; 903, second motor; 904, screw rod; 905, limiting rod; 906, lifting block; 907, connecting plate; 908, polishing wheel. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0022] Please refer to Figures 1-4 The utility model provides a kind of technical scheme: a centerless grinding machine for round steel surface finish machining, including lathe seat 1, the surface of lathe seat 1 is equipped with cabinet door 2, the bottom of lathe seat 1 is equipped with shockproof foot pad 3, the top of lathe seat 1 is fixedly connected with processing table 4, the top of processing table 4 is fixedly connected with controller 5, the top of processing table 4 is fixedly connected with operation table 6, the top of operation table 6 is provided with limiting transmission mechanism 7, the surface of limiting transmission mechanism 7 is provided with processing piece 8, the top of processing table 4 is provided with polishing mechanism 9;

[0023] The polishing mechanism 9 comprises a fixed frame 901, a motor shell 902, a second motor 903, a lead screw 904, a limiting rod 905, a lifting block 906, a connecting plate 907 and a polishing wheel 908, the upper portion of the machining table 4 is fixedly connected with the fixed frame 901, the upper portion of the fixed frame 901 is fixedly connected with the motor shell 902, the inside of the motor shell 902 is installed with the second motor 903, the output end of the second motor 903 is fixedly connected with the lead screw 904, the inner end of the fixed frame 901 is fixedly connected with the limiting rod 905, the lifting block 906 is slidingly connected with the surfaces of the lead screw 904 and the limiting rod 905, one end of the lifting block 906 is fixedly connected with the connecting plate 907, and the surface of the connecting plate 907 is installed with the polishing wheel 908. Through the setting of the polishing mechanism 9, the operator starts the second motor 903 through the controller 5, the second motor 903 starts to operate after being electrified, the output end drives the fixedly connected lead screw 904 to start rotating, the lifting block 906 is slidingly connected with the surfaces of the lead screw 904 and the limiting rod 905, and the limiting rod 905 limits the rotation freedom degree of the lifting block 906, so that the rotation of the lead screw 904 is converted into the linear motion of the lifting block 906 along the lead screw 904 and the limiting rod 905, when the second motor 903 rotates forward, the lead screw 904 drives the lifting block 906 to move downward along the lead screw 904 and the limiting rod 905, because one end of the lifting block 906 is fixedly connected with the connecting plate 907, and the surface of the connecting plate 907 is installed with the polishing wheel 908, so the polishing wheel 908 also approaches the round steel placed on the limiting transmission mechanism 7 as the lifting block 906 descends, when the polishing wheel 908 contacts the surface of the round steel, the polishing wheel 908 rotates at high speed to polish the surface of the round steel, removes the defects such as scale and burr on the surface of the round steel, improves the smoothness and precision of the surface of the round steel, if it is necessary to adjust the polishing pressure of the polishing wheel 908 on the round steel or stop polishing, the operator can control the second motor 903 to rotate reversely through the controller 5, at this time, the lead screw 904 reversely rotates to drive the lifting block 906 to move upward along the lead screw 904 and the limiting rod 905, so that the polishing wheel 908 moves away from the surface of the round steel, during the whole polishing process, the limiting rod 905 always ensures that the lifting block 906 moves linearly, guarantees the stability and accuracy of the lifting of the polishing wheel 908, and further guarantees the quality of the surface finishing of the round steel, meanwhile, the operator can accurately control the rotating speed and direction of the second motor 903 through the controller 5 according to the machining requirements of the round steel, so as to accurately adjust the lifting speed and position of the polishing wheel 908.

[0024] Further, the shock-absorbing foot pads 3 are arranged at the bottom of the lathe seat 1 in four groups, and symmetrically distributed at the four corners of the bottom of the lathe seat 1 along the center axis of the lathe seat 1. Through the arrangement of the shock-absorbing foot pads 3, the four groups of symmetrically distributed shock-absorbing foot pads 3 can evenly disperse the pressure borne by the lathe seat 1, and absorb and buffer the vibration energy generated during the operation of the grinder by using the elastic material properties, which not only avoids the loosening and accelerated wear of the grinder parts caused by vibration, prolongs the service life of the equipment, but also prevents the negative impact of vibration on the machining precision, ensures that the polishing wheel always maintains a stable position and movement track when polishing round steel, and ensures the machining precision and surface quality of the surface of the round steel.

[0025] Further, the limiting transmission mechanism 7 comprises a support 701, a cross beam 702, a sliding groove 703, a connecting rod 704, a wheel disc 705, a first screw rod 706, a partition block 707, a second screw rod 708, a sliding block 709, a mounting frame 710, a limiting wheel 711, a first transmission wheel 712, a first roller 713, a first motor 714, a track 715, a second roller 716 and a second transmission wheel 717, the top of the operation table 6 is fixedly connected with the support 701, the middle part of the support 701 is fixedly connected with the cross beam 702, the surface of the cross beam 702 is provided with the sliding groove 703, the inner end of the cross beam 702 is rotatably connected with the connecting rod 704, one end of the connecting rod 704 is fixedly connected with the wheel disc 705, the other end of the connecting rod 704 is fixedly connected with the first screw rod 706, one end of the first screw rod 706 is fixedly connected with the partition block 707, one end of the partition block 707 is fixedly connected with the second screw rod 708, the surfaces of the first screw rod 706 and the second screw rod 708 are slidably connected with the sliding block 709, the top of the sliding block 709 is fixedly connected with the mounting frame 710, the inner side of the mounting frame 710 is mounted with the limiting wheel 711, the top of the support 701 is mounted with the first transmission wheel 712, one end of the first transmission wheel 712 is fixedly connected with the first roller 713, one end of the first roller 713 is fixedly connected with the first motor 714, the outer side of the first roller 713 is attached with the track 715, the other end of the track 715 is attached with the second roller 716 on the inner side, one end of the second roller 716 is fixedly connected with the second transmission wheel 717, through the setting of the limiting transmission mechanism 7, when the workpiece 8 needs to be machined, the operator first adjusts the distance between the limiting wheels 711 according to the diameter of the round steel, the specific operation is that the wheel disc 705 is rotated, the wheel disc 705 drives the connecting rod 704 fixedly connected therewith to rotate, since the other end of the connecting rod 704 is fixedly connected with the first screw rod 706, and the first screw rod 706 is connected with the second screw rod 708 through the partition block 707, so the first screw rod 706 and the second screw rod 708 will rotate together with the connecting rod 704, since the surfaces of the first screw rod 706 and the second screw rod 708 are slidably connected with the sliding block 709, and the sliding block 709 cooperates with the sliding groove 703 provided on the surface of the cross beam 702, the sliding groove 703 limits the rotation of the sliding block 709, so that the rotation of the first screw rod 706 and the second screw rod 708 is converted into the linear motion of the sliding block 709, and the thread rotation directions of the first screw rod 706 and the second screw rod 708 are usually designed to be opposite, so that when the wheel disc 705 is rotated, the two sliding blocks 709 will move towards or away from each other at the same time, thereby driving the limiting wheels 711 mounted on the inner side of the mounting frame 710 above the sliding blocks 709 to move, until the distance between the two limiting wheels 711 is just suitable for the diameter of the workpiece 8, at this time, the workpiece 8 is stably placed between the two limiting wheels 711, then the first motor 714 is started, the first motor 714 drives the first roller 713 to rotate, since the outer side of the first roller 713 is attached with the track 715, and the other end of the track 715 is attached with the second roller 716 on the inner side,The rotation of the first roller 713 is transmitted to the second roller 716 through the track 715, so that the second roller 716 rotates accordingly. Since one end of the first roller 713 is fixedly connected to the first transmission wheel 712, and one end of the second roller 716 is fixedly connected to the second transmission wheel 717, the first transmission wheel 712 and the second transmission wheel 717 will also rotate with the first roller 713 and the second roller 716 respectively. The first transmission wheel 712 and the second transmission wheel 717 are in contact with the surface of the workpiece 8 during rotation, and drive the workpiece 8 to move axially through friction. At the same time, the limiting wheels 711 on both sides play a supporting and limiting role for the workpiece 8, ensuring the stability of the workpiece 8 during movement and rotation, so that it can be surface finished according to the predetermined trajectory and speed through the polishing mechanism 9, ensuring the continuity and precision of the processing process.

[0026] Further, the position of the sliding block 709 corresponds to the position of the sliding groove 703, and the outer wall size of the sliding block 709 matches the inner wall size of the sliding groove 703. Through the setting of the sliding groove 703 and the sliding block 709, the accuracy and stability of the limiting transmission mechanism 7 are ensured. The accurately corresponding position and the matching size make the sliding block 709 smoothly slide in the sliding groove 703, avoiding shaking and deviation. When the operator rotates the dial 705 to drive the first screw 706 and the second screw 708 to rotate, the sliding block 709 can accurately perform linear motion along the sliding groove 703, thereby driving the mounting frame 710 and the limiting wheels 711 to move stably, accurately adjusting the distance between the two groups of limiting wheels 711 to adapt to workpieces 8 of different diameters, ensuring that the workpiece 8 can be stably limited and supported during subsequent processing, and improving the reliability of the entire processing process.

[0027] Further, the threads of the first screw 706 and the second screw 708 are opposite in direction, and the first screw 706 and the second screw 708 are symmetrically arranged about the central axis of the spacer block 707. Through the setting of the first screw 706 and the second screw 708, the efficiency and symmetry of the limiting wheel 711 distance adjustment are realized. When the dial 705 rotates to drive the connecting rod 704 to rotate the first screw 706 and the second screw 708, the two sliding blocks 709 will move towards each other or away from each other due to the opposite direction of the threads. This allows the distance between the two groups of limiting wheels 711 to be quickly adjusted, saving adjustment time. At the same time, the symmetrical arrangement ensures the synchronization and consistency of the movement of the limiting wheels 711 on both sides, so that the workpiece 8 can be uniformly limited, avoiding deviation or shaking of the workpiece 8 during processing due to uneven limiting, and ensuring processing precision.

[0028] Further, the first motor 714 and the first roller 713 cooperatively constitute a rotating structure, the track 715 drives the second roller 716 to rotate through the first roller 713, and the first motor 714, the track 715 and the second roller 716 are arranged to realize effective power transmission and stable transmission of the workpiece 8, the first motor 714 provides power for the entire transmission system and drives the first roller 713 to rotate, the first roller 713 transmits power to the second roller 716 through the adhesion with the track 715, so that the second roller 716 rotates, this power transmission mode through the track 715 has the advantages of stable transmission and low noise, which can ensure that the first transmission wheel 712 and the second transmission wheel 717 rotate stably, and then drive the workpiece 8 to rotate and axially move through the friction force, so that the workpiece 8 can continuously and stably pass through the polishing mechanism 9 for processing, thereby improving the processing efficiency and quality.

[0029] Further, the second motor 903 and the screw rod 904 cooperatively constitute a rotating structure, the lifting block 906 slides in the inner side of the fixed frame 901 through the screw rod 904, and the second motor 903 and the screw rod 904 are arranged to realize accurate adjustment of the height of the polishing wheel 908, the rotation of the second motor 903 drives the screw rod 904 to rotate, and since the lifting block 906 is threadedly connected with the screw rod 904 and is limited by the limiting rod 905, the rotation of the screw rod 904 is converted into the linear motion of the lifting block 906, so that the lifting block 906 can stably slide up and down along the screw rod 904 and the limiting rod 905 in the inner side of the fixed frame 901, and the position of the lifting block 906 can be accurately adjusted by controlling the forward and reverse rotation and the rotating speed of the second motor 903, so as to drive the connecting plate 907 and the polishing wheel 908 to move up and down, and the polishing wheel 908 can be accurately adjusted to an appropriate height for polishing operation according to the different diameters of the workpiece 8 and the processing requirements, thereby ensuring the polishing accuracy and effect.

[0030] Working principle: after completing the parameter adjustment and preparation work of the limiting transmission mechanism 7 and the polishing mechanism 9, the whole round steel surface finishing centerless grinding machine starts to operate comprehensively, the workpiece 8 with the matched diameter is placed between the two sets of limiting wheels 711 of the limiting transmission mechanism 7, the first motor 714 is started, the power is transmitted to the second roller 716 through the first roller 713 and the track 715, the first transmission wheel 712 and the second transmission wheel 717 are driven to rotate, the round steel is stably rotated and axially moved under the limiting and supporting of the limiting wheels 711 through the friction force, and is uniformly conveyed to the polishing mechanism 9, at the same time, the operator sets the operation parameters of the second motor 903 through the controller 5 according to the material, the original surface condition and the required machining precision of the round steel, the second motor 903 is operated to drive the screw rod 904 to rotate, the lifting block 906 moves along the screw rod 904 and the limiting rod 905, the height of the polishing wheel 908 is accurately adjusted, the polishing wheel 908 is in contact with the surface of the round steel and keeps the appropriate polishing pressure, the polishing wheel 908 rotates at high speed to grind the surface of the round steel, remove the defects such as oxide scale and burr, and improve the smoothness and precision of the surface of the round steel, if it is necessary to adjust the polishing depth or pressure during the machining process, the operator can change the rotating speed and direction of the second motor 903 through the controller 5 at any time, the position of the polishing wheel 908 is adjusted in real time, if the round steel with different diameters needs to be machined, the equipment can be paused, the wheel disc 705 is rotated, the interval of the limiting wheels 711 is quickly and accurately adjusted through the reverse threads of the first screw rod 706 and the second screw rod 708, so that the new machining requirement is adapted, the damping foot pads 3 at the bottom of the lathe seat 1 continuously play a role in absorbing the vibration generated during the operation of the equipment, the stable operation of the parts is ensured, and the machining precision is ensured, the cabinet door 2 plays a protection and storage role, prevents foreign matters from entering the inside of the equipment and affecting the normal operation, and can store some tools, spare parts and the like in the inside of the lathe seat 1, the parts of the whole equipment work cooperatively, the efficient and high-precision finishing of the surface of the round steel is realized, the model of the first motor 714 and the second motor 903 is Y315S-2, and the use process of the round steel surface finishing centerless grinding machine is completed.

[0031] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A centerless grinding machine for finish grinding of round steel surface, comprising a lathe base (1), characterized in that: The surface of the lathe seat (1) is provided with a cabinet door (2), the bottom of the lathe seat (1) is provided with a shock-absorbing foot pad (3), the upper portion of the lathe seat (1) is fixedly connected with a machining table (4), the upper portion of the machining table (4) is fixedly connected with a controller (5), the upper portion of the machining table (4) is fixedly connected with an operation table (6), the upper portion of the operation table (6) is provided with a limiting transmission mechanism (7), the surface of the limiting transmission mechanism (7) is provided with a workpiece (8), the upper portion of the machining table (4) is provided with a polishing mechanism (9); The polishing mechanism (9) comprises a fixing frame (901), a motor shell (902), a second motor (903), a lead screw (904), a limiting rod (905), a lifting block (906), a connecting plate (907) and a polishing wheel (908), the upper portion of the machining table (4) is fixedly connected with the fixing frame (901), the upper portion of the fixing frame (901) is fixedly connected with the motor shell (902), the inside of the motor shell (902) is provided with the second motor (903), the output end of the second motor (903) is fixedly connected with the lead screw (904), the inner end of the fixing frame (901) is fixedly connected with the limiting rod (905), the surface of the lead screw (904) and the limiting rod (905) is slidably connected with the lifting block (906), one end of the lifting block (906) is fixedly connected with the connecting plate (907), the surface of the connecting plate (907) is provided with the polishing wheel (908).

2. The centerless grinder for finish machining of a round steel according to claim 1, characterized in that: The shock-absorbing foot pad (3) is provided with four groups on the bottom of the lathe seat (1), and is symmetrically distributed at the four corners of the bottom of the lathe seat (1) along the central axis of the lathe seat (1).

3. The centerless grinder for finish machining of a round steel surface according to claim 1, characterized in that: The limiting transmission mechanism (7) comprises a support (701), a cross beam (702), a sliding groove (703), a connecting rod (704), a wheel disc (705), a first screw rod (706), a partition block (707), a second screw rod (708), a sliding block (709), a mounting frame (710), a limiting wheel (711), a first transmission wheel (712), a first roller (713), a first motor (714), a track (715), a second roller (716) and a second transmission wheel (717), the top of the operating table (6) is fixedly connected with the support (701), the middle part of the support (701) is fixedly connected with the cross beam (702), the surface of the cross beam (702) is provided with the sliding groove (703), and the inner end of the cross beam (702) is rotatably connected with the connecting rod (704), one end of the connecting rod (704) is fixedly connected with the wheel disc (705), the other end of the connecting rod (704) is fixedly connected with the first screw rod (706), one end of the first screw rod (706) is fixedly connected with the partition block (707), one end of the partition block (707) is fixedly connected with the second screw rod (708), the surfaces of the first screw rod (706) and the second screw rod (708) are slidably connected with the sliding block (709), the top of the sliding block (709) is fixedly connected with the mounting frame (710), the inner side of the mounting frame (710) is mounted with the limiting wheel (711), the top of the support (701) is mounted with the first transmission wheel (712), one end of the first transmission wheel (712) is fixedly connected with the first roller (713), one end of the first roller (713) is fixedly connected with the first motor (714), the outer side of the first roller (713) is attached with the track (715), the other end of the track (715) is attached with the second roller (716) on the inner side, and one end of the second roller (716) is fixedly connected with the second transmission wheel (717).

4. The centerless grinder for finish machining of a round steel surface according to claim 3, characterized in that: The position of the sliding block (709) corresponds to the position of the sliding groove (703), and the outer wall size of the sliding block (709) is consistent with the inner wall size of the sliding groove (703).

5. The centerless grinder for finish machining of a round steel surface according to claim 3, characterized in that: The threads of the first screw rod (706) and the second screw rod (708) are opposite, and the first screw rod (706) and the second screw rod (708) are symmetrically arranged with the central axis of the partition block (707).

6. The centerless grinding machine for finishing the surface of a round steel according to claim 3, characterized in that: The first motor (714) and the first roller (713) cooperatively constitute a rotating structure, and the track (715) drives the second roller (716) to rotate through the first roller (713).

7. The centerless grinder for finish machining of a round steel surface according to claim 1, characterized in that: The second motor (903) and the lead screw (904) cooperatively constitute a rotating structure, and the lifting block (906) slides on the inner side of the fixed frame (901) through the lead screw (904).

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